# SDR 852186

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 11, 2003
- Submitted: June 18, 2003
- Operation: General aviation
- Filed by: [Honeywell Aerospace US, LLC., repair station ZN3R030M](https://openairdocs.org/faa-repair-station/ZN3R030M/honeywell-aerospace-us-llc.md) (OpenAirDocs)
- Aircraft: ZN3R
- Make and model: Lear 35A
- Registry model: [Lear 35A](https://openairdocs.org/model/gates-learjet-35a) (OpenAirDocs)
- Engine: Garrtt TFE73122B
- System (JASC): [8550 · Reciprocating Engine Oil System](https://openairdocs.org/jasc/8550)
- Part: Valve
- Part number: 30743723
- Condition: Failed
- Location: Engine
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/852186

## Discrepancy

DE-OIL VALVE FAILED TO OPEN AND ALLOW OIL TO THE 4/5 CAVITY. THEREBY CAUSING THE NR 4 AND NR 5 BEARINGS TO SEIZE, AND THE ENGINE TO LOCK UP AFTER 17 MIN OF OPERATION.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.